Both are active yeasts with strong activity, which, however, are originated from different strains and by different fermentative techniques.
Feed Active Yeast possesses outstanding adaptability on the low pH condition of the gastrointestinal tract works as a probiotic product. It helps to regulate intestinal microflora and improve feed digestibility. 
Baker's Yeast is active used for the production of baked food, such as bread and buns. It is good at gas production and helps to make the food fluffy and savory.

Active feed yeast is dried pure yeast product in dormant period without any carrier, within more than 80% is live and the total number of viable cells is more than 15 billion per gram.
Brewer's Yeast is the yeast byproduct of beer fermentation. Compared to active feed yeast, the Brewer Yeast contains few live cells and be used as protein source in feed.

It is a pure yeast product contains high concentration of selenium.
Under appropriate conditions, yeast (Saccharomyces cerevisiae) accumulated  large amount of inorganic selenium, and incorporated them into organic  compounds by liquid fermentation process.
The content of organic selenium reaches to 2000PPM.

As a essential trace element, selenium deficiency is closely related to the incidence of more than 40 kinds of human diseases, such as cardiovascular disease, diabetes, immune deficiency, Keshan disease and even cancer. More and more attentions have been paid on this problem in recent years.
Soil selenium deficiency is a common problem in the world. There are more than 40 countries and/or regions around the world that face this problem. Food supply alone can not meet the needs of selenium in animals and therefore additionally supplement is necessary.

Selenium occurs naturally in a number of inorganic forms, including selenide-, selenate-, and selenite-containing minerals.
In living systems, selenium is found in the amino acids selenomethionine, selenocysteine, and methylselenocysteine. In these compounds, selenium plays a role analogous to that of sulfur. Another naturally occurring organic selenium compounds is dimethyl selenide. The selenium yeast, rich in selenomethionine and selenocysteine, is an ideal organic selenium source.
The organic selenium exhibit higher toxicological safety, physical activity and absorption rate than inorganic selenium.

Yeast Cell Wall represents 26 - 32 % of the dry weight of Saccharomyces and other kinds of yeast. This Cell Wall is a structural component and gives the yeast its shape and rigidity.

Yeast Cell Wall is a non-specific stimulator of the immune system of both human and animals.
Yeast Beta-Glucan – an ingredient of Yeast Cell Wall -can stimulate the cells of the immune system (macrophages) and help to overcome bacterial infections.
Mannanoligosaccharide (MOS), another ingredient of Yeast Cell Wall, has been demonstrated to bind to pathogenic bacteria in the gut and then carry them through and out of the intestinal tract and prevent diarrhea.

Both are resulted from the selfdigestion of the proteins and other constituents of the yeast by the enzymes contained in the yeast cells.
However, there are two main differences between Yeast Extract and Autolyzed Yeast:
• The autolysis stage of the production process is shorter for Autolyzed Yeast compared to Yeast Extract, resulting in a partial hydrolysis of the yeast constituents.
• Cell Walls are not removed from Autolyzed Yeast, resulting in a product which is only partially soluble in water.

Active Yeast is the yeast product with the whole activity and worked as probiotics via metabolism and multiplies.
Autolyzed Yeast is inactive yeast product, used as a source of high quality proteins, peptides and amino acids and nucleotides.

As one of the leading yeast manufacturer in the world, the Angel Yeast focuses on yeast research for about 25 years, and now it has the annual yeast production capacity of more than 100 thousand MT.
--Strictly selected yeast strains that fit for using in livestock;
--Main products can be manufactured in any of three plants, which enables Angel to avoid supply risk;
--Certified ISO9001, ISO22000, HALAL, KOSHER
--4 technology centers, R & D team and technical application team led by over a dozen PhDs and animal nutrition experts;
--Comprehensive farm trials are carried out in our experimental base;
--Angel Yeast Co., LTD is one of the vice Chairman Units of China Animal Husbandry and Veterinary Association;
--Angel has established distribution network in over 100 countries to ensure the timely supply of goods.